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Property, Plant and Equipment - Schedule of Other Items Related to Property Plant and Equipment (Detail) (USD $)
In Thousands, unless otherwise specified |
12 Months Ended | ||
|---|---|---|---|
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Dec. 31, 2014
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Dec. 31, 2013
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Dec. 31, 2012
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| Property, Plant and Equipment [Abstract] | |||
| Depreciation expense | $ 75,286 | $ 75,401 | $ 68,312 |
| Capitalized interest | $ 4,192 | $ 3,142 | $ 6,178 |